/**
 * Constant-time string equality, shared by every secret check in `@nifrajs/web`. Internal: no
 * `exports` entry points here, so it never becomes public API.
 *
 * One owner per package rather than a copy per call site - this is the primitive whose whole value
 * lies in a detail (no early exit) that a well-meaning "simplification" silently removes, and a bug
 * in it is invisible in review and in tests, since a timing-unsafe compare returns the same answers.
 */
/**
 * Compare two strings without leaking, via timing, where they first differ. A length mismatch returns
 * `false` up front: the length isn't the secret, and different-length buffers can't be compared in
 * constant time anyway. Encodes to bytes first so multi-byte characters compare by content, not by
 * UTF-16 code unit.
 */
export declare function timingSafeEqual(a: string, b: string): boolean;
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